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Abstract:

In a pixel unit and a display panel having the pixel unit, the pixel unit
includes a pixel portion configured to display a color, and a
transmissive portion configured to transmit light. The pixel portion is
disposed at a central portion of the pixel unit and the transmissive
portion is disposed at a peripheral portion adjacent to the central
portion, or the transmissive portion is disposed at the central portion
of the pixel unit and the pixel portion is disposed at the peripheral
portion adjacent to the central portion.

Claims:

1. A pixel unit comprising: a pixel portion configured to display a
color; and a transmissive portion configured to transmit light, wherein
the pixel portion is disposed at a central portion of the pixel unit and
the transmissive portion is disposed at a peripheral portion adjacent to
the central portion, or the transmissive portion is disposed at the
central portion of the pixel unit and the pixel portion is formed at the
peripheral portion adjacent to the central portion.

2. The pixel unit of claim 1, wherein the area of the transmissive
portion is in a range of about 90% to about 110% of the area of the pixel
portion.

3. The pixel unit of claim 1, wherein the peripheral portion comprises a
first space to accommodate a thin film transistor and a second space to
accommodate a portion of a data line or a portion of a gate line, and
each of the first space and the second space is formed at a corner of the
peripheral portion.

4. The pixel unit of claim 3, wherein the pixel unit comprises a
connector at the first space to connect the pixel unit and the thin film
transistor.

5. The pixel unit of claim 1, wherein one of the pixel portion and the
transmissive portion in the central portion has a quadrilateral shape.

7. The pixel unit of claim 1, wherein one of the pixel portion and the
transmissive portion in the central portion has a rhombic shape.

8. The pixel unit of claim 7, wherein the pixel portion has the rhombic
shape, and at least one vertex of the pixel portion makes contact with a
side of the pixel unit.

9. The pixel unit of claim 1, wherein one of the pixel portion and the
transmissive portion in the central portion has a parallelogrammic shape.

10. The pixel unit of claim 9, wherein the pixel portion has the
parallelogrammic shape, and at least one side of the pixel portion
overlaps with a side of the pixel unit.

11. The pixel unit of claim 1, wherein the pixel portion has a polygonal
shape, and at least one side of the pixel portion overlaps with a side of
the pixel unit.

12. A display panel comprising: a first display substrate comprising a
pixel unit having a pixel portion configured to display a color and a
transmissive portion configured to transmit light; and a second display
substrate configured to face the first substrate, wherein the pixel
portion is disposed at a central portion of the pixel unit and the
transmissive portion is disposed at a peripheral portion adjacent to the
central portion, or the transmissive portion is disposed at the central
portion of the pixel unit, and the pixel portion is disposed at the
peripheral portion adjacent to the central portion.

13. The display panel of claim 12, wherein the first display substrate
comprises a color filter comprising a main pixel having the pixel unit,
and the main pixel comprises multiple pixel units having a pixel portion
and a transmissive portion.

14. The display panel of claim 12, wherein the color filter has a hole as
the transmissive portion to accommodate a transmissive material.

15. The display panel of claim 12, wherein the area of the transmissive
portion is in a range of about 90% to about 110% of the area of the pixel
portion.

16. The display panel of claim 12, further comprising: a liquid crystal
layer disposed between the first display substrate and the second display
substrate, wherein the first display substrate further comprises a first
base substrate and a first electrode, the second display substrate
comprises a second base substrate, and a second electrode, and the second
electrode faces the pixel unit.

17. The display panel of claim 16, wherein the first display substrate or
the second display substrate comprises a thin film transistor, a data
line and a gate line.

18. The display panel of claim 17, wherein the first display substrate or
the second display substrate comprises a protecting film, an ohmic
contact layer, a semiconductor layer and a gate insulation film, the gate
line is perpendicular to the data line, and the thin film transistor is
connected to the data line, the gate line and the pixel unit.

19. The display panel of claim 17, wherein the first electrode, the
second electrode, the data line and the gate line comprise indium tin
oxide (ITO) or graphene.

20. A color filter comprising: a main pixel having at least one subpixel,
wherein the at least one subpixel comprises a pixel portion disposed at a
first region and a transmissive portion disposed at a second region
adjacent to the first region.

21. The color filter of claim 20, wherein the main pixel comprises a
first subpixel configured to display a red color, a second subpixel
configured to display a green color and a third subpixel configured to
display a blue color.

22. The color filter of claim 20, wherein the first region is disposed at
a peripheral portion of the subpixel and the second region is disposed at
a central portion of the subpixel.

23. The color filter of claim 20, wherein the transmissive portion is a
hole filled with a transmissive material.

Description:

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority from and the benefit of Korean
Patent Application No. 2011-0068251, filed on Jul. 11, 2011, which is
hereby incorporated by reference for all purposes as if fully set forth
herein.

BACKGROUND OF THE INVENTION

[0002] 1. Field of the Invention

[0003] Exemplary embodiments of the present invention relate to a pixel
unit and a display panel having the pixel unit, and, more particularly,
to a pixel unit having a transparent portion and a display panel having
the pixel unit.

[0004] 2. Discussion of the Background

[0005] A liquid crystal display (LCD) apparatus is thin and light, so that
the LCD apparatus is often used for a monitor, a laptop computer, a
mobile phone, and etc. The LCD apparatus includes an LCD panel displaying
an image using a light transmittance property, and a backlight unit
disposed under the LCD panel. The backlight unit provides light to the
LCD panel.

[0006] A transparent display apparatus which uses an ambient light source
or an indirect light to display the image has been developed. The
conventional display apparatus has an opaque back plate which cannot
receive the light, but the transparent display apparatus is transparent
for the ambient light to pass through the transparent display apparatus.
Thus, the transparent display apparatus has the display panel through
which the light passes and has a transparent structure.

[0007] Generally, there is a trade-off between the transmittance of the
transparent display apparatus and the display quality (i.e. color
reproducibility, a contrast ratio, a viewing angle, etc.). Thus, as the
transmittance is improved by increasing the transparency, the color
reproducibility may be decreased, and vice versa.

[0008] The transparent display apparatus transmits the ambient light from
a backside of the transparent display apparatus, and displays the image
using the ambient light when the display signal is turned on. Thus, the
transmittance and the color reproducibility need to be guaranteed for the
transparent display apparatus to display the high quality image as well
as to maintain the high transmittance.

SUMMARY OF THE INVENTION

[0009] Exemplary embodiments of the present invention provide a pixel unit
capable of improving both transmittance of light and display quality.

[0010] Exemplary embodiments of the present invention also provide a
display panel having the pixel unit.

[0011] Additional features of the invention will be set forth in the
description which follows, and in part will be apparent from the
description, or may be learned by practice of the invention.

[0012] An exemplary embodiment of the present invention discloses a pixel
unit including a pixel portion configured to display a color, and a
transmissive portion configured to transmit light. The pixel portion is
disposed at a central portion of the pixel unit and the transmissive
portion is disposed at a peripheral portion adjacent to the central
portion. Alternatively, the transmissive portion is disposed at the
central portion of the pixel unit and the pixel portion is disposed at
the peripheral portion adjacent to the central portion.

[0013] An exemplary embodiment of the present invention discloses a
display panel including a first display substrate including a pixel unit
having a pixel portion configured to display a color and a transmissive
portion configured to transmit light, and a second display substrate
configured to face the first substrate. The pixel portion is disposed at
a central portion of the pixel unit and the transmissive portion is
disposed at a peripheral portion adjacent to the central portion.
Alternatively, the transmissive portion is disposed at the central
portion of the pixel unit, and the pixel portion is disposed at the
peripheral portion adjacent to the central portion.

[0014] An exemplary embodiment of the present invention discloses a color
filter including a main pixel having at least one subpixel. The at least
one subpixel includes a pixel portion disposed at a first region and a
transmissive portion disposed at a second region adjacent to the first
region.

[0015] It is to be understood that both the foregoing general description
and the following detailed description are exemplary and explanatory and
are intended to provide further explanation of the invention as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are included to provide a further
understanding of the invention and are incorporated in and constitute a
part of this specification, illustrate embodiments of the invention, and
together with the description serve to explain the principles of the
invention.

[0017] FIG. 1 is a plan view illustrating a display panel according to an
exemplary embodiment of the present invention.

[0018] FIG. 2 is a cross-sectional view taken along the line I-I' of the
display panel in FIG. 1 according to an exemplary embodiment of the
invention.

[0019] FIG. 3 is a plan view illustrating a subpixel of FIG. 1 according
to an exemplary embodiment of the invention.

[0020] FIG. 4 is a plan view illustrating a subpixel according to another
exemplary embodiment of the invention.

[0021] FIG. 5 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0022] FIG. 6 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0023] FIG. 7 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0024] FIG. 8 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0025]FIG. 9 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0026] FIG. 10 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

DETAILED DESCRIPTION OF THE ILLUSTRATED EMBODIMENTS

[0027] The invention is described more fully hereinafter with reference to
the accompanying drawings, in which embodiments of the invention are
shown. This invention may, however, be embodied in many different forms
and should not be construed as limited to the embodiments set forth
herein. Rather, these embodiments are provided so that this disclosure is
thorough, and will fully convey the scope of the invention to those
skilled in the art. In the drawings, the size and relative sizes of
layers and regions may be exaggerated for clarity. Like reference
numerals in the drawings denote like elements.

[0028] It will be understood that when an element or layer is referred to
as being "on" or "connected to" another element or layer, it can be
directly on or directly connected to the other element or layer, or
intervening elements or layers may be present. In contrast, when an
element or layer is referred to as being "directly on" or "directly
connected to" another element or layer, there are no intervening elements
or layers present.

[0029] FIG. 1 is a plan view illustrating a display panel according to an
exemplary embodiment of the present invention. FIG. 2 is a
cross-sectional view taken along the line I-I' of the display panel in
FIG. 1 according to an exemplary embodiment of the invention.

[0030] Referring to FIG. 1 and FIG. 2, the display panel 10 includes a
first display substrate 100, a second display substrate 200 facing the
first display substrate 100, and a liquid crystal layer 300 disposed
between the first display substrate 100 and the second display substrate
200.

[0031] The first display substrate 100 includes a first base substrate
110, a color filter 120, and a first electrode 130. The color filter 120
including a main pixel (MP) and the first electrode 130 are sequentially
formed on the first base substrate 110. A surface of the first electrode
130 that faces the second substrate 200 may be planarized. Alternatively,
although not shown in FIG. 2, the first electrode 130 may be formed on
the color filter 120 with a uniform thickness.

[0032] The first display substrate 100 includes the color filter 120
including the main pixel MP having at least one subpixel (SP). The
subpixel SP includes a pixel portion (CA) displaying a color and a
transmissive portion (TA) transmitting light. The main pixel MP is formed
in the color filter 120. An example of the main pixel MP is illustrated
in FIG. 1, and FIG. 2, but the color filter 120 may include a plurality
of main pixels MPs. A pixel portion is defined by a plurality of gate
lines and a plurality of data lines crossing the gate lines in the main
pixel.

[0033] The main pixel MP may include a first subpixel SP1, a second
subpixel SP2 and a third subpixel SP3. For example, a pixel includes
three subpixels. Thus, the main pixel MP includes the first subpixel SP1
displaying a red color, the second subpixel SP2 displaying a green color,
and the third subpixel SP3 displaying a blue color. A subpixel may
correspond to an electrode ("sub-electrode"). Although not shown in
figures, the main pixel MP may further include a subpixel displaying a
white color. The first, second, and third subpixels SP1, SP2 and SP3 may
be spaced apart from each other by a predetermined distance. The number
and colors is of subpixels, and distances between subpixels may be
variously changed to satisfy different conditions.

[0034] Each of the first, second, and third subpixels SP1, SP2, and SP3
includes the pixel portion CA displaying a color and the transmissive
portion TA transmitting light. The first subpixel SP1 includes a first
transmissive portion TA1 and a first pixel portion CA1. The second
subpixel SP2 includes a second transmissive portion TA2 and a second
pixel portion CA2. The third subpixel SP3 includes a third transmissive
portion TA3 and a third pixel portion CA3. Hereinafter, each of the
first, second, and third subpixels SP1, SP2, and SP3, each of the first,
second, and third pixel portions CA1, CA2, and CA3, and each of the
first, second, and third transmissive portions TA1, TA2, and TA3 may be
described as a subpixel SP, a pixel portion CA and a transmissive portion
TA, respectively, in case of describing substantially common features.

[0035] Either the pixel portion CA or the transmissive portion TA is
formed at a central portion of the subpixel SP, and the other is formed
at a peripheral portion adjacent to the central portion. Thus, the pixel
portion CA or the transmissive portion TA is selectively formed at the
central portion. The transmissive portion TA may be formed at the
peripheral portion if the pixel portion CA is formed at the central
portion. The pixel portion CA may be formed at the central portion if the
transmissive portion TA is formed at the peripheral portion. The pixel
portion CA or the transmissive portion formed at the central portion may
have various shapes in the subpixel SP.

[0036] The area of the transmissive portion TA may be in the range of
about 90% to about 110% of the area of the pixel portion CA. The area of
the transmissive portion TA may be in the range of about 40% to about 60%
of the area of the subpixel SP. To improve transmittance and display
quality of the display panel 10 at the same time, the area ratio between
the transmissive portion TA and the pixel portion CA may be about 5:5.
The color filter 120 may have a hole (or a hollow) for the transmissive
portion TA. A transparent organic material or a transparent inorganic
material having high transmittance may be filled in the hole for the
transmissive portion TA.

[0037] The second display substrate 200 may include a second base
substrate 210, a gate insulation film 220, a protecting film 230 and a
second electrode 240. The gate insulation film 220, the protecting film
230 and the second electrode 240 are sequentially formed on the second
base substrate 210.

[0038] In addition, the second display substrate 200 may further include
gate lines GLn and GLn+1, data lines DLm-1, DLm, DLm+1 and DLm+2, and a
thin film transistor (TFT). The data lines DLm-1, DLm, DLm+1 and DLm+2
are insulated from the gate lines GLn and GLn+1 by the insulation film
220 and cross the gate lines GLn and GLn+1. The thin film transistor TFT
is a switching element electrically connected to one of the gate lines
GLn and GLn+1 and one of the data lines DLm-1, DLm, DLm+1 and DLm+2. The
gate lines GLn and GLn+1, the data lines DLm-1, DLm, DLm+1 and DLm+2 and
the thin film transistor TFT are formed on the second display substrate
200. The protecting film 230 may be formed as a passivation layer, and it
may cover the gate lines GLn and GLn+1, the data lines DLm-1, DLm, DLm+1
and DLm+2, and the thin film transistor TFT.

[0039] In addition, a semiconductor layer 221 and an ohmic contact layer
223 may be sequentially formed on the gate insulation film 220 to form
the data lines DLm-1, DLm, DLm+1 and DLm+2.

[0040] The gate lines GLn and GLn+1 extend parallel to a first direction
D1, and a second gate line GLn+1 is disposed at a first distance from a
first gate line GLn in a second is direction D2 substantially
perpendicular to the first direction D1. The data lines DLm-1, DLm, DLm+1
and DLm+2 extend parallel to the second direction D2, and are disposed
along the first direction D1 with a second distance to divide the
subpixels SP1, SP2 and SP3. For example, a first data line DLm is formed
between the first subpixel SP1 and the second subpixel SP2 adjacent to
each other, and a second data line DLm+1 is formed between the second
subpixel SP2 and the third subpixel SP3 adjacent to each other.

[0041] The thin film transistor TFT may include a gate electrode GE, a
channel layer (not shown) disposed on the gate electrode GE, and source
and drain electrodes SE and DE disposed on the channel layer. For
example, the gate electrode GE is electrically connected to the first
gate line GLn, the source electrode SE is electrically connected to the
second data line DLm+1, and the drain electrode DE is spaced apart from
the source electrode SE. The semiconductor layer 221 and the ohmic
contact layer 223 may be sequentially formed on the gate insulation film
220. The semiconductor layer 221 may form the channel layer.

[0042] The color filter 120 is formed in the first display substrate 100
in an exemplary embodiment, but the color filter 120 may be formed in the
second display substrate 200. Further, the transmissive portion TA may be
formed in the second display substrate 200.

[0043] The first base substrate 110 and the second base substrate 210 may
include a glass material and/or a transparent plastic material to
increase the transmittance.

[0044] In addition, the gate insulation film 220 and the protecting film
230 may include transparent organic material or transparent inorganic
material.

[0045] The first electrode 130 and the second electrode 240 may include
indium tin oxide (ITO) or graphene for high electro-conductivity and high
transmittance. In addition, the gate lines GLn and GLn+1 and the data
lines DLm-1, DLm, DLm+1 and DLm+2 may also include the ITO or the
graphene.

[0046] The ITO is a transparent conductive film having the
electro-conductivity and includes a compound of indium and tin oxide
(In2O3, SnO2). The ITO is usually formed via a sputtering
process. The graphene is a carbon compound having a honeycomb structure
in which carbon atoms are combined in a hexagonal shape. Electrons of the
graphene may drift 100 times freer than that of silicon. The graphene is
100 times stronger than steel, and has a relatively high elasticity as an
expanded area of the graphene may be enlarged as about 20% of the entire
area. Even though being bent or stretched, the graphene maintains the
electro-conductivity. Heat-conductivity of the graphene is 10 times
higher than that of copper, and has relatively higher transmittance to
transmit about 98% of light.

[0047] In addition, a liquid crystal layer 300 is disposed between the
first display substrate 100 and the second display substrate 200.

[0048] The ambient light propagated into the backside of the display panel
10 passes through the first, second, and third transmissive portions TA1,
TA2, and TA3. Thus, the display panel 10 transmits the ambient light from
the backside of the display panel 10 like a glass window if a display
signal is turned off, and displays an image using the ambient light if
the display signal is turned on.

[0049] Accordingly, the subpixel includes the pixel portion displaying the
color and the transmissive portion transmitting the light, thereby
improving the transmittance and the display quality at the same time.

[0050] FIG. 3 is a plan view illustrating a subpixel of FIG. 1 according
to an exemplary embodiment of the present invention.

[0051] Referring to FIG. 3, a subpixel SPa has a transmissive portion TAa
formed at a central portion of the subpixel SPa in a rectangular shape. A
pixel portion CAa is formed at a peripheral portion of the subpixel SPa,
and surrounds the transmissive portion TAa. The transmissive portion TAa
has a rectangular shape which has a first side a1, a second side a2
substantially parallel to the first side a1, a third side a3 and a fourth
side a4 substantially parallel to the third side a3. The first and second
sides a1 and a2 may be shorter than the third and fourth sides a3 and a4.

[0052] For example, the subpixel SPa may have the rectangular shape having
a width of about 230 μm and a length of about 368 μm. A space
having a width of about 16 μm may be formed for the thin film
transistor TFT at a vertex of the subpixel SPa. The space may be a
square-shaped hollow and each of the four sides of the square-shaped
hollow may have a length of about 16 μm. A space having a faceted
shape and having a width of about 8 μm may be formed at the rest of
vertices of the subpixel Spa for accommodating the data lines and the
gate lines overlapping with each other. The space having the faceted
shape may be a square-shaped hollow and each of the four sides of the
square-shaped hollow may have a length of about 8 μm. Each of the
first and second sides a1 and a2 of the transmissive portion TAa disposed
at the central portion of the subpixel SPa may have a length of about 170
μm. Each of the third and the fourth sides a3 and a4 may have a length
of about 288 μm.

[0053] FIG. 4 is a plan view illustrating a subpixel according to another
exemplary embodiment of the invention.

[0054] Although one subpixel SPb is illustrated in FIG. 4, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPb and each
of the subpixels SPb may display a single color.

[0055] Referring to FIG. 4, the subpixel SPb has a pixel portion CAb
formed at a central portion of the subpixel SPb in a rectangular shape. A
transmissive portion TAb is formed at a peripheral portion of the
subpixel SPb, and surrounds the pixel portion CAb. The pixel portion CAb
has the rectangular shape which has first and second sides b1 and b2
parallel to each other, and third and fourth sides b3 and b4
substantially parallel to each other. Each of the first and second sides
b1 and b2 may be shorter than each of the third and fourth sides b3 and
b4. For example, the shape of the subpixel SPb may be substantially the
same as the subpixel SPa of FIG. 3. The outer shape of the subpixels in
FIG. 5, FIG. 6, FIG. 7, FIG. 8, FIG. 9 and FIG. 10 may be substantially
the same as that of the subpixel SPa of FIG. 3. Each of the first and
second sides b1 and b2 of the pixel portion CAb disposed at the central
portion of the subpixel SPb may have a length of about 170 μm. Each of
the third and the fourth sides b3 and b4 may have a length of about 288
μm.

[0056] FIG. 5 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0057] Although one subpixel SPc is illustrated in FIG. 5, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPc and each
of the subpixels SPc may display each own color.

[0058] Referring to FIG. 5, the subpixel SPc has a pixel portion CAc
formed at a central portion of the subpixel SPc in a square shape. A
transmissive portion TAc is formed at a peripheral portion of the
subpixel SPc, and surrounds the pixel portion CAc. The pixel portion CAc
has the square shape which has first and second sides c1 and c2
substantially parallel to each other, and third and fourth sides c3 and
c4 substantially parallel to each other. Each of the first and second
sides c1 and c2 may have a substantially the same length as that of each
of the third and fourth sides c3 and c4. For example, each of the first,
second, third, and fourth sides c1, c2, c3, and c4 may have a length of
about 170 μm.

[0059] FIG. 6 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0060] Although one subpixel SPd is illustrated in FIG. 6, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPd and each
of the subpixel SPd may display each own color.

[0061] Referring to FIG. 6, the subpixel SPd has a pixel portion CAd
formed at a central portion of the subpixel SPd in a rhombic shape. A
transmissive portion TAd is formed at a peripheral portion of the
subpixel SPd, and surrounds the pixel portion CAd. The pixel portion CAd
has the rhombic shape which has first and second sides d1 and d2
substantially parallel to each other, and a third and fourth sides d1 and
d4 substantially parallel to each other. Each of the first and second
sides d1 and d2 may have a substantially the same length as that of each
of the third and fourth sides d3 and d4. For example, each of the first,
second, third, and fourth sides d1, d2, d3, and d4 may have a length of
about 140 μm.

[0062] FIG. 7 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0063] Although one subpixel SPe is illustrated in FIG. 7, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPe and each
of the subpixels SPe may display each own color.

[0064] Referring to FIG. 7, the subpixel SPe has a pixel portion CAe
formed at a central portion of the subpixel SPe in a rhombic shape. A
transmissive portion TAe is formed at a peripheral portion of the
subpixel SPe, and surrounds the pixel portion CAe. Each of vertices e11,
e22, e33 and e44 of the rhombic shape makes contact with each of sides of
the subpixel SPe. The pixel portion CAe has the rhombic shape which has
first and second sides e1 and e2 substantially parallel to each other,
third and fourth sides e3 and e4 substantially parallel to each other.
Each of the first and second sides e1 and e2 may have a substantially the
same length as that of each of the third and fourth sides e3 and e4. For
example, each of the first, second, third, and fourth sides e1, e2, e3,
and e4 may have a length of about 143 μm.

[0065] FIG. 8 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0066] Although one subpixel SPf is illustrated in FIG. 8, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPf and each
of the subpixels SPf may display each own color.

[0067] Referring to FIG. 8, the subpixel SPf has a pixel portion CAf
formed at a central portion of the subpixel SPf in a parallelogrammic
shape. First and second sides f1 and f2 of the pixel portion CAf
respectively overlap with first and second sides of the subpixel SPf. A
transmissive portion TAf is formed at both sides of the pixel portion
CAf. For example, each of the first and second sides f1 and f2 of the
pixel portion CAf may have a length of about 170 μm. Each of the third
and the fourth sides f3 and f4 may have a length of about 370 μm.

[0068]FIG. 9 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0069] Although one subpixel SPg is illustrated in FIG. 9, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPg and each
of the subpixels SPg may display each own color.

[0070] Referring to FIG. 9, the subpixel SPg has a pixel portion CAg
formed at a central portion of the subpixel SPg in a hexagonal shape. A
central portion of the pixel portion CAg is wider than top and bottom
portions of the pixel portion CAg. First and second sides g1 and g2 of
the pixel portion CAg facing each other respectively overlap with first
and second sides of the subpixel SPg. A transmissive portion TAg is
formed at both sides of the pixel portion CAg. Each of third and fourth
sides g3 and g4 may have a substantially the same length as that of each
of fifth and sixth sides g5 and g6. For example, each of the first and
second sides g1 and g2 of the pixel portion CAg may have a length of
about 76.6 μm. Each of the third, fourth, fifth, and the sixth sides
g3, g4, g5, and g6 may have a length of about 188 μm.

[0071] FIG. 10 is a plan view illustrating a subpixel according to still
another exemplary embodiment of the invention.

[0072] Although one subpixel SPh is illustrated in FIG. 10, as illustrated
in FIG. 2, a main pixel may include a plurality of subpixels SPh and each
of the subpixels SPh may display each own color.

[0073] Referring to FIG. 10, the subpixel SPh has a pixel portion CAh
formed at a central portion of the subpixel SPh in a pentagonal shape. A
central portion of the pixel portion CAh is wider than top and bottom
portions of the pixel portion CAh. In addition, a first vertex h11 of the
pentagonal shape makes contact with a first side of the subpixel SPh, and
a first side h1 of the pixel portion CAh overlaps with a second side of
the subpixel SPh. The transmissive portion TAh is formed at both sides of
the pixel portion CAh. For example, the first side h1 of the pixel
portion CAg may have a length of 76.6 μm. Each of second and third
sides h2 and h3 may have a length of about 130 μm. Each of fourth and
fifth sides h4 and h5 may have a length of about 246 μm.

[0074] As mentioned above, according to exemplary embodiments of the
present inventions, a subpixel including a pixel portion displaying a
color and a transmissive portion transmitting light are formed to improve
transmittance and display quality at the same time.

[0075] According to exemplary embodiments of the present invention, a
central portion of a pixel unit may have a polygonal shape, a circular
shape, or an elliptical shape. A side of the central portion may refer to
an edge of the central portion if the central portion has a polygonal
shape. The shape of a peripheral portion of the pixel unit is not limited
to a rectangular shape. A side of the peripheral portion may refer to an
outer edge of the peripheral portion if the peripheral portion has a
polygonal shape. A portion of the central portion may make contact with
an outer edge of the peripheral portion.

[0076] It will be apparent to those skilled in the art that various
modifications and variations can be made in the present invention without
departing from the spirit or scope of the invention. Thus, it is intended
that the present invention cover the modifications and variations of this
invention provided they come within the scope of the appended claims and
their equivalents.